VolumeScientific Papers of the Bureau of Standards, Vol. 15, p. 163-184 (1919) Scientific Paper 339 (S339)
The sulphur boiling point occupies a position of unusual importance among the thermometric fixed points on account of the care and accuracy with which its temperature has been determined, the precision with which this temperature may be reproduced, but most of all on account of the very general practice of using it to determine one of the fundamental calibration constants of the platinum resistance thermometer, which serves as the most precise and convenient means now available for defining the temperature scale in the range -50 degrees to 500 degrees Celsius. The best measurements available are insufficient to show that the scale so defined differs from the thermodynamic scale in any part of this range.
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